The significant rain delay in Miami did not derail Novak Djokovic who breezed to a 6-1 6-0 win over Lukas Rosol at the Sony Open.

The world No. 1 is bidding for a fourth win in the event and he was in sizzling form against Rosol. In a 53-minute demolition, Djokovic broke on five occasions and was completely dominant on his own serve.

"It is a great start," Djokovic said after powering into round three. "After Indian Wells, I tried to rest. There are different conditions here, but tonight was perfect for tennis. I enjoyed every moment of it and I love this court."

Commenting on the near three-and-a-half-hour rain delay at Crandon Park, Djokovic said: "I probably had a seven-hour delay in Indian Wells before the fourth round, so this was a mild delay. The hotel where we are staying is nearby, so it's convenient to rest and prepare."

There was a shock in the second round, as Juan Martin Del Potro was sent packing by Tobias Kamke who claimed a 7-6(5) 6-1 success.

"He took the chance to beat me tonight and I think that's it," Del Potro said. "He deserved to win."

David Ferrer advanced to the third stage after scheduled second-round opponent Dmitry Tursunov retired through injury. Ferrer now faces Italian Fabio Fognini for a place in the fourth round.

Seventh Janko Tipsarevic made light work of qualifier Dudi Sela, dropping six games in his 6-2 6-4 victory.

Tommy Haas overcame a battling Igor Sijsling 6-0 5-7 6-3 to book a third round clash with Alexandr Dolgopolov, who defeated former world No. 3 Nikolay Davydenko 6-0 2-6 6-0.

James Blake advanced with a 6-2 6-3 victory over world No. 27 Julien Benneteau; American Blake will now face Albert Ramos in the third round.

Florian Mayer suffered a 3-6 6-7 defeat at the hands of Slovenian Grega Zemlja, who will play the winner of Lleyton Hewitt and Gilles Simon.